The five stages of sex organ growth and penis development are described below:
Stage 1: Childhood
Stage 1 is childhood, before puberty begins. Your sex organs do not change very much during this stage. As the rest of your body grows, the penis, scrotum, and testicles grow a little bit larger, too, but not by very much. What growth there is takes place very slowly. The testicles are usually less than 3 ml in size. You won’t have any pubic hair yet. Boys usually don’t grow pubic hair until Stage 2 or later.
Stage 2: Testicles and Scrotum Enlarge
Stage 2 is the beginning of puberty. A boy reaches Stage 2 when his testicles and scrotum begin to enlarge. During childhood, these sex organs grow very slowly. When puberty hits, they start growing at a much faster rate. If your testicles are 4 ml or larger in size you have probably reached Stage 2 and started puberty.
The penis itself doesn’t get much larger in this stage. The biggest change is in the size of the testicles and scrotum. As the testicles grow larger, the scrotum gets longer. The testicles and scrotum hang lower. The skin of the scrotum gets thinner and looser. The scrotum is more baggy and wrinkled. The testicles no longer fill the scrotal sac. The skin of the scrotum has a new “feel” to it. The color changes too. The skin of the scrotum reddens or gets darker in color.
Most boys develop their first pubic hairs during this stage. But many boys don’t develop their first pubic hairs until Stage 3 or
Boys typically reach Stage 2 when they’re ten to twelve years old, but there are many boys who start this stage when they are only nine. There are also many who don’t start until they’re thirteen or nearly fourteen. There are also some perfectly normal and healthy boys who get to Stage 2 even earlier than the age of eight or later than age fourteen.
This stage may last anywhere from just a few months to more than two years. On the average, it lasts about a year.
Stage 3: The Penis Grows Longer
Stage 3 begins when the penis starts to grow longer. It doesn’t get much wider during this stage. The biggest change is in the length of the penis.
The skin of the penis and scrotum continues to deepen in color in this stage. The scrotum and testicles also continue to grow during this stage.
If your pubic hair didn’t start growing during Stage 2, you may notice your first pubic hairs during this stage. If you already have pubic hair, it may get darker and curlier during this stage.
Most boys reach this cage between the ages often and fourteen. The average age for starting Stage 4 is twelve or thirteen. This stage usually lasts anywhere from a couple of months to a year and a half.
Stage 4: The Penis Grows Wider
In Stage 4, the penis grows wider and the glans becomes more developed. The penis also continues to grow longer but the major changes are in its width and in the glans. The skin of the scrotum and penis continues to darken in color. The testicles continue to grow and the scrotum hangs lower. Most boys have pubic hair when they start Stage 4. But there arc some who don’t develop pubic hair until they reach this stage.
Boys typically start Stage 4 when they are thirteen or fourteen years old. But many boys are only eleven or twelve when they start this stage. There are also many boys who arc fifteen, sixteen, or seventeen before they reach this stage. Here again, there are a few perfectly healthy normal boys who fall outside these age ranges. This stage usually lasts anywhere from six months to two years.
Stage 5: Adult Stage
This is the final, mature stage. The testicles are fully grown. They are usually about 1¾ inches long and between 14 and 27 ml n size. The scrotum is also fully developed. The skin of the scrotum and penis has gotten even deeper in color.
The penis is now fully developed. As with other parts of the body, the size of the penis varies from one person to the next. Boys typically reach Stage 5 when they are fourteen to sixteen years old. But some boys reach this stage when they’re only twelve or thirteen and others not until they’re older than sixteen. As with the other stages some normal boys will fall outside the age ranges I mentioned here.